ML20214X400
| ML20214X400 | |
| Person / Time | |
|---|---|
| Site: | 07000349 |
| Issue date: | 07/22/1983 |
| From: | Miller D NORTHWESTERN UNIV., EVANSTON, IL |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20197E174 | List: |
| References | |
| 22563, NUDOCS 8610030441 | |
| Download: ML20214X400 (10) | |
Text
- - -..
'f
/D y
tg NORTHWESTERN UNIVERSITY EVANSTON - CHICAGO OFFICE OF RESEARCH SAFETY July 22, 1983 a - 106 wAno sultoiNG 303 EAST CHICAGO AVENUE CHICAGO, ILLINOIS 606II U.S. Nuclear Regulatory Comission Material Licensing Branch Division of Fuel Cycle and Material Safety
.g' Washington, D.C. 20555 Re: SNM-330 u
Dear Sir / Madam:
M Northwestern University would like to renew its Special Nuclear Merial license, SNM-330. Northwestern University is a non-profit, educalional institution and the material requested under this license is to B used
_3 or teaching and training purposes. Therefore, no application fee is f
J
/ required, as specified in 10CFR170.11.4.
Some changes have been made in the program since the fomer license appli-cation was submitted on June 30, 1978. These changes are identified below.
There are no changes, however, in the quantity or type of material. The license limits should remain, Plutonium:
Pu Be sealed sources 112 grams Uranium-235 Any fom 1 gram A new Radiation Safety Handbook has been printed to supercede the old Handbook of Radiological Operations. A copy of the new handbook is enclosed.
The Radiation Safety Comittee membership is described in a letter to your office dated December 6, 1982. Changes in committee memberships occur in the fall at Northwestern University and when the new member /s are appointed, we will notify you.
The facilities have changed somewhat.
Room B959 in the Technological Insti-tute, Evanston campus has now been designed to house the sealed sources (Pu Be) covered under this license. A sketch of this room is enclosed.
When the sources are needed for experimentation, they are used in Room B970, described in previous licenses. This laboratory, B970, is a nuclear engineer-ing teaching laboratory, and houses the sub-critical reactor.
This laboratory and the sealed Pu Be sources remain under the direction of Dr. Donald Eggen, Professor, Mechanical and Nuclear Engineering Department.
Dr. Eggen's curriculum vitae has been submitted previously.
The primary equipment used for neutron surveys is the PRS 2P/NRD-Rem Ball with a BF3 detector. Other instruments in the Evanston office are described on the attached inventory.
Calibration procedures are also enclosed. Surveys are perfomed on room B959 on a monthly basis.
Room B970 is inspected on a quarterly basis.
Records of room surveys are maintained in the Evanston office, Technological Institute, Room B911.
j ( #
h b3 A
sbO722
-aj-O
(v')
Q V
UNNRC: pag 2 SNM-330 reapplication Personnel dosimeters, either neutron Trak-etch or P1 badges, are supplied by R.S.Landauer, Jr., Inc. on a monthly basis.
Dosimeter reports are sent to Dr. Eggen, the Evanston radiation safety office, and the pemanent record maintained in the files on the Chicago campus.
Leak tests on all sealed sources, if in use, are carried out at 6-month intervals, as specified in the license, dated August 21, 1978.
Copies of these tests are maintained on the Evanston campus.
No waste materials are generated under this license, but any wastes generated would be handled by ADC0 Services, Inc., Tinley Park, Illinois.
Please disregard Appendices A, B, C, and D submitted in license application dated June 30, 1978.
If additional infomation is needed, please contact Dr. David R. Miller, Radiation Safety Officer at the address shown above.
Yours truly,
$lkb David R. Miller, Director (Radiation Safety Officer)
J
~
I
Appendix B 1
Instrumtnt List - Evanston Campus I.D. NO.
INSTRUMENT MODEL #
- AVAIL.
RAD. DETECT.
RANGE USE SN 843 VICT0REEN Ion Chamber 440 1
/,7', X 0-3 mR/hr survey of sealed to 0-300 mR/hr source areas
)
2mg/cm2 SN 2050 740F 1
As I
0-25mR/hr to survey of sealed 0-25k mR/hr source areas 0.00025" mylar window EBERLINE SN 1856 Gas Prop.
PAC-4G-3 1
oc,4, 3H 0-500x10 g/ min lab survey h
3 counter (with TP-1, AC-21, 218) 0.85 mg/cmd 3-H wipes NUCLEAR CHICAG0 3
6 RS 058 Prop. counter 8700 1
x,g, N 10 cpm Q-gas wipe test of packages; sealed sources; lab wipes EBERLINE RS100 (geiger)
E-120G 1
oc#p,7 Y 0-700cfmin.to lab survey; 0-70x10 g/ min; detection of 1.7 mg/cm x-ray diffrac-end window tion leakage EBERLINE 3
j# 7' y 0-500x10 125-I, 131 -I,
g RS 019 PRM-5-3 w/
1 SPA-3 c/ min 123m-Te, 57-Co, (Scint.-Nal) surveys
. EBERLINE PRS-2P/NRD 1
neutrons ratemeter:
SN: 297 10 cpm to 999,999 cpm
$"IV'YI"9 dose ratemeter:
Nuclear Eng. labs 0.00001 to 99,900 I
Pagg 2 i
o l
i i
i I.D. NO.
INSTRUMENT MODEL #
- AVAIL.
RAD. DETECT.
RANGE USE
'l b
VICT0REEN I
Dosimeter /
l Charger 906 1
Dosimeter 541 R 3
0-200nR
[
3 Dosimeter 541 F 1
0-200mR Dosimeter 883 1
0-500mR r
Dosimeter 050 1
0-5 R
1 l
The following does not belong to the Radiation Safety Office but is readily available for our use:
h[
VICT0REEN Ion Chamber 470A 4
g, 7, X 0-3mR or mR/hr x-ray machine to 0-1000 R/hr
- survey, to 1R integral teaching labs l
J Well counter 4
4 l
4 i
G i
a l
=
l l
i I
i
r O
O
~
APPENDIX B p.1
/
Northwestern University Calibration Procedure, Evanston campus A.
Ion chambers, geiger counters, portable gas flow proportional counters:
1.
Pertinent information (instrument type, manufacturer, model numbers and serial numbers of both meter and probe, and calibration date),
is recorded on the calibration data form.
2.
Physical inspection of the instrument for mechanical damage.
In-strument is cleaned if necessary.
3.
Battery check, using " battery check" switch on the instrument. In cases where the batteries are low, they are checked with the Triplett Model 630A volt-ohmmeter (20 000 ohms / volt) or equivalent.
Low voltage batteries are replaced as needed.
4.
Where applicable (as stated in specific instrument manuals) circuit bias and/or tube voltages are checked using the volt meter.
5.
The input voltage threshold sensitivity is determined using the i
Eberline MP-1 Mini Pulser, which has a continuously variable voltage output for this purpose.
6.
The instrument is placed in the 137Cs radiation field, at distances appropriate for a "two-points-per-scale" calibration.
The two points on each scale are separated by at least 50% of the scale.
For example, on a 0-100mR/hr scale, 80mR/hr and 20mR/hr are calibra-tion points.
If nonlinearity cf the meter is found, the two points are adjusted such that the average fractional deviation is equal for both high and low ends of the scale.
If the measured exposure rate differs at any point by greater than or equal to 10% but less than 20%, a calibration graph, chart, or correction factor is attached to the instrument.
Instruments are removed from service for repair and recalibration when measured exposure rates deviate by greater than or equal to 20% from the true exposure rate.
7.
For G.M. and other pulse counting meters the Eber11ne Pulser, MP-1, isusedtocalibratetheegectronics.
This instrument has a range of from 1.0c/ min to 1.6x10 c/ min at an accuracy of +/-0.1%.
The output pulse has a 0.2 u-sec rise time', a 0.2 usec window width and a 3 usec fall.
This is not the sole means of calibration; the survey meters are also exposed to the radiation field.
8.
The portable gas flow proportional counters (PAC 4G3/AC218) are calib-rated with 99Tc plated sources at 280+/-10, 3460+/-l_00, 33 900+/-1000, and 283 500+/-8*500 cpm (ea), as certified by the manufacturer.
Eberline Instrument Corp.
These sources are NBS traceable and the total estimated error is +/-3%.
The activities correspond to count rates which lie approximately in the midpoint of each range on the Lin-Log scales.
T.L. 9/23/81
p.2 Calibration Procedure, Evanston Campus B.
Nuclear Chicago Gas Flow Proportional Counter 1
The counter is checked for voltage plateau using the Nuclear
, Chicago Ra(D+E) source, or other appropriate source.
2.
The counter is checked for reproducibility by means of a Chi-square statistical analysis. At least 20 repeated measurements are made for this analysis.
3.
Counting efficiencies are determined using the NEN Beta source set
- NES200 A(NBS traceable) reference sources.
C.
An appropriate check source is counted in specified geometry for each instrument.
This information is recorded on the calibration fonn.
D.
Calibration frequency is semi-annually.
E.
Calibration Sources:
1.
NEN Beta Source Set #NES200 A 2.
137Cs, Nuclear Associates Model 726,99.2 mci (3/30/78) serial nuniar 158, 3.
99Tc Electroplated Beta Source Set, Eberline serial numbers 7644, 1
7645, 7646, and 7647, calibration date 3/14/77.
F.
Health Physics:
The 137Cs source is constructed with a built-in timer which returns the source automatically into the source housing at the end of the specified duration of exposure.
The field is limited such that an operator behind the source is not exposed to the direct beam.
Doors to the calibration facility are locked if possible and are posted with the correct radiation warning signs.
Personal dosimetry is used (film badge).
An accessory survey meter is kept on hand during the calibration procedure.
Protective clothing is worn.
3 No handling of the 99Tc electroplated beta sources is necessary.
Beta reference sources are used in planchets and are not handled with bare hands.
T.L.
9/23/81
CALIBRATION OF 2 PRS-2P/NRD 1, The instrument is splashproof but should be inspected to be as clean and dry as possible.
- 2. Battery check is performed by connecting a well-regulated power supply supplying an adjustable voltage between 5 volts and 7 volts, at 150mA~,
to the battery connector on chassis. Range switch is in the OFF posi-tion.
- 3. Adjust power supply to 5.75 volts and turn range switch to position A; battery legend should indicate BATT OK. Adjust power supply to 5.6 volts; battery legend should indicate ERROR.
- 4. Adjust BATT OK ADJ potentiometer R520 if necessary to give above indi-cations.
- 5. To adjust high voltage connect an electrostatic voltmeter or any other instrument with an extremely high impedance, to capacitor C601 and place range switch in the HV position.
- 6. Adjust HV ADJ (front panel) for 1500 volts. If display does not indicate 1500 volts 15%, adjust VC0 frequency, R515, potentiometer.
- 7. Adjust HV ADJ to 500 volts. If display does not indicate 500 t 5% ad-just VC0 OFFSET, R516, potentiometer. Repeat as of ten as necessary for complete adjustment.
- 8. Next, the calibration boards and their control switches are adjusted and programmed.
- 9. For the calibration function to operate, the CALIB switch of the cali-bration board must be in.the IN position and the function switch on the front panel must be in the RATE mode.
- 10. The SCALAR switch is not part of the calibration function. It provides a choice of readout for the scalar functions. In the STORE position the counts are stored and the display readout is updated at the completion of the timed cycle or when the range switch is placed in the STOP po-
} sition. In the increment position the display is updated with each count.
11~. Connect a pulse generator (Eberline HP-1) and set it at a rate of 100K cpm.
Vary the time switch on the front panel from 0.5 min. to 5 min. and record instrument reading.
'I2. Set selector switch on RATE mode starting with A,B,C,D, as the input signal from the HP-1 is varied from 800 cpm, 8K cpm, 80K cpm and 800K cpm respectively.
52 6
- 13. Expose instrument to Cf,(NE 116) with a source strength of 8.31 x 10 n/sec (3.685 ugm) on 1-26-78 and apply the inverse square law. Record instrument readingsand distancss.
~ -
.O.
O.
Date 1/rceve SOURCE FABF.ICAIF.D IVR:
Northwestern 1[niversity, Source Type D'niversity Lone Source No.
116 Primary Source Enemosulation Secondary Container Bo.'of Source Capsules 1
Container 1*aterial SS
)
Capsule Material Pt-103 Ir-External Dia:eter it.75
- o.05 nr.
- Inner Capsule Wall Thickness 0.25
- o.012 mm External unsth h8.40
- o.50 mr o
Outer. Capsule Vall Thicknese 0.40
- O.012 nm Active kngth 15.00-
- o.50 Closure Material Pueion Weld Closure F.aterial pn.1nn Veld
~
. CIDSURE TIST g-Met' hod Each source capsule is deconta:ineted after closure until all exteric surfaces are free of transferable conta=ination as determined by a vipe test. After ilecontamination the capsule is iccersed in a helic-ittmosphere with a pressure of at least 30 pounds,cer square inch for a period of 30 minutes, then transferred to a helium leak detector.
The leak detector has a rinitun sensitivity of 2.8 x 10
- cc helium per second.
l Test Dst.e The finished source was found free of detectable leaks on 1/P3/76
. SOUR.CE SSSI:GTH Calibration The source described above. has been calibrated at the Sannnah River Laboratory by ec= paring its strength to thr.t of a **'Cf source cali-brated by the National Bureau of Standards. The caretrison is tede by counting on a 3Fs neutron Detector. The ***Cf content of the source is the effective or net californiu:n con ent calculated fro:
the e=ission rate and is given in equivalent veight units assu.ing
- g 2 311 x 10 neutron: per secor.d per ticrogra: of maaC f.
There fore,
8 corrections.for self absorp. ion of neutrons in the capsule valls
\\
and isotopic conte..t of californiu= are unnecessary by'the source user.
I.
Strength The neutron ecission rate of this source was found to be *516x 10 8
s 5
neutrons per secon:1 with a standard error of 6 3 0"> an enecuve
- C.* content of 3.685 pg with a standard error of 3.O f, f
I on 1-P6-78
- s 7o d'). i,.' %.4 $h
.N'.. Eerwell, Director Uuclear Engg and l'nterials Section Savannah River Laboratory E. I. du Pont de Nencurs
y f'y () v V [ Instruments l Heanurck.i nt, 1:1cctronica ' lc h t - e 1,aboratory Shop Shop 8 I inmples ... _ l.g. g. - __ _. o ym.4 _ clooi //, neut[m j l / howin wi/ nets tron r,ene ra to r I l concret,c ~[f, j,[, ',sg',n t bl oclu 9l! , c ric, p lill.d l .e_: 7.'.' = F :r--r-&,G7=irre- $7~.l \\ __ hallway door r tr,nre 1 : rinor pinn of D970 Technologien1 Inntitute s O o 9 h a
NORDDfESTERN UNIVERSITY .RADI ICAL SAFETY SURVEY REPORT S BUILDING TECH ROOM B959 DATE BY l Routine / / Spot Check / f Special / / Equipment / / Survey Instrument-Sources of Ionizing Radiation .a - p .-l ^ ' : >.' - 1, 'c l 9. o .~ TYPE FORM ACTIVITY a w u w
- '* l' ;- Ql, y1,L
- ' i:
Cf-252 c .f - C. t._.a t_. .'y, ( g - Pu-Be .ptorage g source ~ binet Co-60 .,A ; drum ca i ( A.' neutron f,! howitzer o Ventilation: ,,i M.* ~. Comments: i .h - a '. ~ ':3'. 5.,o'.' ~, g o. , ~o. ;.. ,o, .? t, ~ .a. o p l 4' ' ' i...g,, j. SURVEY FINDINGS mr/hr mrem /hr 1 2 i 5 6 7 8 i 9 i
0 Background
RECO E NDATIONS: 11.6-3 . - - -., _.. _ - -. _..... _ _. _.. -. _ - - _ _. - _. _. _.. _ - - _ - _ _ _ _ _ -.. _ _ _ _ _ _ _ _ _ _ _ _ _ _. _ _ -.. - _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _.}}